Portable swinging derrick.



L; T. 'MITGHELL PORTABLE SWINGING lDERRIQK. APPLIGATIoN FILED APn.s,19os.

905,208'. ,A y Patented Dec. 1.,'19'08.

UNITED Vs rAfrEsfrATENT OFFICE.

LEWIS r. MITCHELL, or (sAN'rA MARGARITMGALIFORNIA.

PORTABLE sWpINGING DERRICK.

To all whom it may concernf 1 i Be it known that I, LEWIS T. MITCHELL,

a citizen of the United States, residing at Santa` Margarita, in thecounty of San Luis Obispo and Stateof California, have invented certain .new and .useful Improvements in Portable` Swinging Derricks; and

I do declare the following. to be a'full, clear,

and exact description of the` same, such as -will enable others skilled 4in the artto which it'appertains to make and use the same, ref

erence being had to the accompanying draw-` ings, and to the characters of ,reference marked thereon, which forma part of this applicati-on. l

This invention relates to improvements. in yderricks and particularlyk to that class known as portable swinging derricks used 'in stack- Ing hay, straw or similar'material, the object of the invention being to produce a simple and elective `implement for ythep'ur'- pose which will be ,simple and inexpensive of construction and` yetexceedingly strong and durable and well adapted to perform. the functions for which it is devised. Also" to produce an implement for the purpose which can be easily handled and operated by one person. This object I accomplish by means of a carrying truck. on` which is turnably secured a main mast having a swinging boom and a strong and eflicient truss brace, said mast and boom being equipped with net and tackle in thev manner and for the purpose as will' appear. Also by such other and further construction aswillfappear by a perusal of the following specifica-9 tion and claims.

In the drawings similar characters of ref.

erence indicate corresponding partsv in the several views.

Figure 1 is a side elevation ofthe device as dismantled ready to be transported. Fig. 2 is a similar view showing the equipment of the device positionedl ready for use.V Fig.

3 is a top plan view'of a mast retaining block mechanism.

Referring more particularly to the charr-l circular orifice 3, while'4 is a similar blockpivoted on said body,and having acentral semi-circular orifice 5 adaptedto be lbrought into register with the orice Sand be heldV v specejcatibri of Letters Patent. Application `filed Apr18, 1908. Serial No. 425,862.

Patented Dec. 1, 1908.

infsuch position by meansof a removable pin 6 extending through the block 4.and

body 1. Disposed on each side of said blocks 2 and 4 are upwardly extending supporting frames 7 between which is swung a collar or ring 8 through which is disposed the mast or main standard 9 which is provided at its lower end with a metal cap 10 normally held in the oriiceB-.

Secured on-the mast 9 is a cross beam 11 braced Vby means of a truss brace member 12 extendingV from the top of the mast 9 over the outer end of said beam 11, thence throughuthering 8 and secured then along the .lower `,portion of themast 9. Said truss brace 12 is provided with a turnbuckle 13 4at an intermediate point for tightening purposes etc. Hinged to the other end of the beam 11 is a boom 14 on the outer end of which are securedpulleys 15 and 16 on the upper and lower sides respectively.

able stationing point.

21 is a rope extending through the pulley 16 and having the usual net 22 secured to its outer end, said rope extending through a pulley on the mast 9 thence through a pulley 24 on the body `1. f

25 is a pulley secured to the lower end of ythe mast 9 and 26 is a pulley secured to the body'l, there being a rope tackle 27 disposed in the same for' the purposes as will appear.

28 is'a forked standard disposed on the rear ofthe body 1 in which the mast 9 normally rests when not in use, the same then lying parallel to the body 1 and the boom 14 also lying parallel to the mast 9 when not` inuse, all as shown in Fig. 1. This makes a compact and simple arrangement fortransporting said derrick. When it is desired to position said derrick ready for use the block 4 is opened and the rope 27 op- .erated` in conjunction with the pulleys 25 and 26'to swing themast 9 into upright position by means of the swinging collar v8. The said mast is then locked in the orifice l3-`-5 by means of swinging the block 4 into closed position and locking Vit in such position by means of the pin 6. When said mast`9 is so secured the rope 18 is operated4 to adjust the boom 14 at the desired angle and the rope 2l is operated to raise and lower' the net 22 as is desired, the mast 9 swinging freely in the collar 8 to any point necessary to deposit the load in said net.

Among the main features claimed for my improved derricl; is the means for holding the mast erect and the means for raising and lowering it. Also the feature of the truss brace l2 extending through the collar 8, I have found to be of great advantage, since it braces the mast effectually and at the same time swings freely in said collar, which would not be permitted if such brace was outside said collar.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfils the objects of the invention as set forth herein.

IVhile this specification sets forth in detail the present and preferred construction of my invention, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. In a device of the character described,

a body, two standards thereon, a collar` swung between said standards, a mast disl posed through said collar, a cross beam on said mast, a truss brace extending from the top of said mast over one end of said cross beam, through said collar and thence along the lower end of said mast and below said collar and a boom and tackle mechanism disposed on said mast, as set forth.

2. In a device of the character described, a body, two standards thereon, a collar swung between said standards, a mast disposed through said collar, a cross beam of the upper end of said mast, a boom pivotally mounted in one end of said cross beam, a pulley held in the other end of said beam, a pulley on the upper outer end of .said beam, a pulley on the upper end of said mast above said beam, a pulley held in said mast above said last named pulley, a rope secured to said third named pulley and ex tending through said second named pulley and thence through said third named pulley, said second named pulley, said fourth named pulley and said first named pulley to a desired point, and a net and tackle lucchanism on said boom as set forth.

In testimony whereof I atlix my signature in presence of two witnesses.

LEWIS T. MITCHELL. lVitnesses PERcr S. VVRRSTER, FRANK H. CARTER. 

